<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title>闰年判断</title>
	</head>
	<body>
		<script>
			var year=prompt("请输入年份：");
			
			if(year%4==0&&year%100!=0||year%400==0){
				alert("闰年");
			}
			else{
				alert("不是闰年");
			}
		</script>
	</body>
</html>
